WO2015146883A1 - Film de résine polyester, procédé de production de film de résine polyester, plaque polarisante, dispositif d'affichage d'image, film de revêtement dur, film de détection pour panneaux tactiles, film de prévention de diffusion de verre et panneau tactile - Google Patents

Film de résine polyester, procédé de production de film de résine polyester, plaque polarisante, dispositif d'affichage d'image, film de revêtement dur, film de détection pour panneaux tactiles, film de prévention de diffusion de verre et panneau tactile Download PDF

Info

Publication number
WO2015146883A1
WO2015146883A1 PCT/JP2015/058674 JP2015058674W WO2015146883A1 WO 2015146883 A1 WO2015146883 A1 WO 2015146883A1 JP 2015058674 W JP2015058674 W JP 2015058674W WO 2015146883 A1 WO2015146883 A1 WO 2015146883A1
Authority
WO
WIPO (PCT)
Prior art keywords
polyester resin
resin film
film
formula
stretching
Prior art date
Application number
PCT/JP2015/058674
Other languages
English (en)
Japanese (ja)
Inventor
真一 中居
直良 山田
Original Assignee
富士フイルム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Priority to CN201580015388.5A priority Critical patent/CN106104332B/zh
Publication of WO2015146883A1 publication Critical patent/WO2015146883A1/fr

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133311—Environmental protection, e.g. against dust or humidity

Definitions

  • the present invention relates to a polyester resin film, a method for producing a polyester resin film, a polarizing plate, an image display device, a hard coat film, a sensor film for a touch panel, a glass scattering prevention film, and a touch panel.
  • Image display devices such as liquid crystal display (LCD), plasma display (PDP), electroluminescence display (OELD or IELD), field emission display (FED), touch panel, and electronic paper have a polarizing plate on the display screen side of the image display panel. Is arranged. For example, a liquid crystal display device has low power consumption, and its application is expanding year by year as a space-saving image display device.
  • a liquid crystal display device has a major disadvantage that the viewing angle dependence of a display image is large, but a wide viewing angle liquid crystal mode such as a VA (Virtual Alignment) mode and an IPS (In-Place-Switching) mode is put into practical use As a result, the demand for liquid crystal display devices is rapidly expanding even in markets where high-quality images such as televisions are required.
  • VA Virtual Alignment
  • IPS Intelligent Place-Switching
  • a polarizing plate used in a liquid crystal display device is generally composed of a polarizer made of a polyvinyl alcohol film or the like on which iodine or dye is adsorbed and oriented, and a transparent protective film (polarizing plate protective film) on both sides of the polarizer. It has a configuration.
  • the protective film on the surface (the side opposite to the display side) to be bonded to the liquid crystal cell is called an inner film, and the opposite side (display side) is called an outer film.
  • Polyester resin films and the like have advantages such as low cost, high mechanical strength, and low moisture permeability, and therefore are expected to be used as outer films.
  • polyester resin films are increasingly used as touch panel members such as transparent conductive films, scattering prevention films, and hard coat films. .
  • a polyester resin film that can simultaneously improve rainbow unevenness when viewed from the front and rainbow unevenness when viewed from the oblique direction, a method for producing a polyester resin film, a polarizing plate, and an image.
  • a display device, a hard coat film, a sensor film for a touch panel, a glass scattering prevention film, and a touch panel are provided.
  • the present inventors have controlled the film thickness, the birefringence in the film in-plane direction, the birefringence in the film thickness direction, and the birefringence unevenness in the film plane. As a result, it was found that rainbow unevenness when the display is viewed from an oblique direction can be eliminated, and the present invention has been completed.
  • the present invention which is a specific means for achieving the above object, is as follows.
  • Th represents the thickness of the polyester resin film, the unit of the thickness of the polyester resin film is ⁇ m;
  • nx represents the refractive index in the slow axis direction in the polyester resin film plane,
  • ny represents the refractive index in the fast axis direction in the plane of the polyester resin film,
  • nz represents the refractive index in the thickness direction of the polyester resin film, and
  • n ⁇ represents (nx ⁇ ny) in an arbitrary area 1 m 2 of the polyester resin film.
  • the polyester resin film according to [1] preferably satisfies the following formula (5); 130 ° C. ⁇ Tpre ⁇ 200 ° C.
  • Formula (5) Tpre represents the pre-peak temperature measured by differential scanning calorimetry of the polyester resin film, and the unit is ° C.
  • the polyester resin film according to [1] or [2] preferably has a polyester resin film density of 1.370 to 1.390 g / cm 3 .
  • the polyester resin film according to any one of [1] to [3] has a thermal shrinkage ratio of 3.5 and TD in the polyester resin film after standing at 150 ° C. for 30 minutes. % Or less is preferable.
  • the polyester resin film according to any one of [1] to [4] has a thermal shrinkage of 0.3% in the MD direction and the TD direction of the polyester resin film after standing at 80 ° C. for 24 hours. The following is preferable.
  • the width of the polyester resin film is preferably 0.6 to 6 m.
  • the polyester resin film according to any one of [1] to [6] is preferably biaxially oriented.
  • a transverse stretching step of transversely stretching the polyester resin film after the longitudinal stretching in the width direction perpendicular to the longitudinal direction, A method for producing a polyester resin film satisfying the following formulas (1 ′) and (6) to (11); 15 ⁇ m ⁇ Th ′ ⁇ 60 ⁇ m Formula (1 ′) 2.8 ⁇ DMD ⁇ 3.6
  • Th ′ represents the thickness of the polyester resin film after the transverse stretching step, and the unit of the thickness of the polyester resin film after the transverse stretching step is ⁇ m; Represents the draw ratio in the machine direction, DTD represents the draw ratio in the transverse direction, TSET represents the maximum surface temperature at the time of heat setting, TTDs represents the film surface temperature at the start of transverse stretching, and TTDe is the end of transverse stretching Represents the film surface temperature of the hour; units of TSET, TTDs, and TTDe are in ° C.
  • nx (MD) represents the refractive index in the slow axis direction in the plane of the polyester resin film after longitudinal stretching
  • ny (MD) represents the polyester resin film after longitudinal stretching
  • the refractive index in the in-plane fast axis direction is represented, and nz (MD) represents the refractive index in the thickness direction of the polyester resin film after longitudinal stretching.
  • the method for producing a polyester resin film according to [8] or [9] includes a heat fixing part for heating and crystallizing a heat-fixed portion of the polyester resin film after longitudinal stretching and transverse stretching, and heat fixing. Heating the formed polyester resin film, and including a step of transporting a thermal relaxation portion that relaxes the tension of the polyester resin film and removes residual distortion of the film, In the thermal relaxation portion, it is preferable that the longitudinal relaxation rate is 1 to 10% and the lateral relaxation rate is 3 to 23%.
  • the method for producing a polyester resin film according to any one of [8] to [10] is a method of heating and crystallizing the heat-fixed polyester resin film after longitudinal and transverse stretching.
  • the fixing unit includes a step of heating the heat-fixed polyester resin film, transporting a heat relaxation unit that relaxes the tension of the polyester resin film and removes residual distortion of the film, It is preferable that an intermediate cooling part is included between the laterally stretched part and the heat fixing part.
  • the method for producing a polyester resin film according to [11] preferably satisfies the following formula (14) in the intermediate cooling section; 30 ° C. ⁇ TMC ⁇ (TTDe ⁇ 10) ° C.
  • TMC represents the minimum film surface temperature
  • TTDe represents the film surface temperature at the end of the transverse stretching
  • both units are ° C.
  • a polarizing plate comprising a polarizer and the polyester resin film according to any one of [1] to [7].
  • An image display device comprising the polyester resin film according to any one of [1] to [7] or the polarizing plate according to claim 13.
  • the image display device includes a light source unit having at least blue, green, and red light emission peaks, and a liquid crystal cell having polarizing plates on both sides, the green light emission peak of the light source unit, and red Of the emission peaks, the half width W having the smaller half width is preferably 50 nm or less.
  • the light source unit includes at least a blue light emitting diode or an ultraviolet light emitting diode and a phosphor capable of emitting light by being excited by light from the blue light emitting diode or the ultraviolet light emitting diode. It is preferable.
  • At least one of the phosphors is a quantum dot.
  • a hard coat film comprising the polyester resin film according to any one of [1] to [7].
  • a touch panel sensor film comprising the polyester resin film according to any one of [1] to [7].
  • a glass scattering prevention film comprising the polyester resin film according to any one of [1] to [7].
  • a touch panel provided with at least any one of a film and the glass scattering prevention film as described in [20].
  • a polyester resin film capable of simultaneously improving rainbow unevenness when viewed from the front and rainbow unevenness when viewed from an oblique direction, a method for producing a polyester resin film, a polarizing plate, an image display device, and hardware
  • a coat film, a sensor film for a touch panel, a glass scattering prevention film, and a touch panel can be provided.
  • a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • the polyester resin film of the present invention (hereinafter also simply referred to as “film”) satisfies the following formulas (1) to (4). 15 ⁇ m ⁇ Th ⁇ 60 ⁇ m (1) 0 ⁇ nx ⁇ ny ⁇ 0.020 (2) 0.120 ⁇ (nx + ny) / 2 ⁇ nz ⁇ 0.160 Formula (3) 0 ⁇ n ⁇ ⁇ 0.014 (4)
  • Th represents the thickness of the polyester resin film, the unit of the thickness of the polyester resin film is ⁇ m;
  • nx represents the refractive index in the slow axis direction in the polyester resin film plane,
  • ny represents the refractive index in the fast axis direction in the plane of the polyester resin film,
  • nz represents the refractive index in the thickness direction of the polyester resin film, and
  • n ⁇ represents (nx ⁇ ny) in an arbitrary area 1 m 2 of the polyester resin film. It represents the difference between the maximum and minimum values.
  • the polyester resin film of the present invention can simultaneously improve rainbow unevenness when viewed from the front and rainbow unevenness when viewed from an oblique direction.
  • the rainbow unevenness when viewed from the front can be improved by reducing the in-plane birefringence, but the rainbow unevenness when viewed from an oblique direction cannot be improved.
  • the maximum thickness and the minimum of the birefringence in the film plane, the birefringence in the thickness direction of the film, and the birefringence in the plane within an arbitrary area 1 m 2 of the film are set in a specific range.
  • the thickness of the polyester resin film of the present invention satisfies the following formula (1), preferably satisfies the following formula (1-2), and more preferably satisfies the following formula (1-3).
  • 15 ⁇ m ⁇ Th ⁇ 60 ⁇ m (1) 20 ⁇ m ⁇ Th ⁇ 55 ⁇ m Formula (1-2) 23 ⁇ m ⁇ Th ⁇ 50 ⁇ m Formula (1-3)
  • Th represents the thickness ( ⁇ m) of the polyester resin film.
  • the thickness of the polyester resin film is 60 ⁇ m or less, rainbow unevenness becomes difficult to see.
  • the thickness Th of the polyester resin film for example, using a contact-type film thickness meter, 50 points are sampled at equal intervals over 0.5 m in the longitudinally stretched direction (longitudinal direction), and further, the film width direction (perpendicular to the longitudinal direction). ) was sampled at regular intervals (50 equal parts in the width direction) over the entire width of the film, and the thicknesses of these 100 points were measured. The average thickness of these 100 points was determined and used as the thickness of the polyester film.
  • the in-plane birefringence of the polyester resin film of the present invention satisfies the following formula (2), preferably satisfies the following formula (2-2), and more preferably satisfies the following formula (2-3).
  • nx represents the refractive index in the slow axis direction in the polyester resin film surface
  • ny represents the refractive index in the fast axis direction in the polyester resin film surface.
  • the in-plane birefringence of the polyester resin film of the present invention is larger than 0, the in-plane birefringence distribution (n ⁇ ) does not become too large, and rainbow unevenness becomes difficult to see. If the in-plane birefringence of the polyester resin film of the present invention is 0.020 or less, rainbow unevenness is difficult to see.
  • the birefringence in the thickness direction of the polyester resin film of the present invention satisfies the following formula (3) from the viewpoint of rainbow unevenness, preferably satisfies the following formula (3-2), and satisfies the following formula (3-3): It is more preferable.
  • nx represents the refractive index in the slow axis direction in the polyester resin film surface
  • ny represents the refractive index in the fast axis direction in the polyester resin film surface
  • nz represents the refractive index in the polyester resin film thickness direction. If the birefringence in the thickness direction of the polyester resin film of the present invention is less than 0.120, the vertical and horizontal orientations become too small, causing problems in film strength, and the film cannot be formed. If the birefringence in the thickness direction of the polyester resin film of the present invention is less than 0.160, rainbow unevenness is difficult to see.
  • nx, ny, and nz can be measured as follows. Using two polarizing plates, the orientation axis direction of the polyester resin film was determined, and a 4 cm ⁇ 2 cm rectangle was cut out so that the orientation axis directions were perpendicular to each other, and used as a measurement sample. For this sample, the biaxial refractive index (nx, ny) perpendicular to each other and the refractive index (nz) in the thickness direction were determined by an Abbe refractometer, and equations (2) to (4) were determined.
  • the unevenness (in-plane birefringence distribution) as a difference between the maximum value and the minimum value of (nx ⁇ ny) in an arbitrary area 1 m 2 of the polyester resin film of the present invention satisfies the following formula (4), and It is preferable to satisfy the formula (4-2), and it is more preferable to satisfy the following formula (4-3).
  • n ⁇ For a polyester resin film 1 m 2, uniformly sampled film width direction, the flow direction for each 100 mm. For example, in the case of a film having a film width of 2 m and a film length of 0.5 m, a total of 100 film pieces are cut out, 20 points in the width direction and 5 points in the flow direction. About the magnitude
  • In-plane birefringence, birefringence in the thickness direction, and in-plane birefringence distribution are the types of polyester resin used in the film, the amount of the polyester resin and additives, the addition of a retardation developer, and the film thickness.
  • the film can be adjusted by the stretching direction and stretching ratio of the film.
  • the pre-peak temperature measured by differential scanning calorimetry preferably satisfies the following formula (5), more preferably satisfies the following formula (5-2), and the following formula ( It is more preferable to satisfy 5-3).
  • the pre-peak temperature measured by differential scanning calorimetry preferably satisfies the following formula (5), more preferably satisfies the following formula (5-2), and the following formula ( It is more preferable to satisfy 5-3).
  • Formula (5) 140 ° C. ⁇ Tpre ⁇ 190 ° C.
  • Formula (5-2) 150 ° C. ⁇ Tpre ⁇ 180 ° C.
  • Tpre represents a pre-peak temperature measured by differential scanning calorimetry of a polyester resin film, and its unit is ° C.
  • the pre-peak temperature By setting the pre-peak temperature to 130 ° C. or higher, rainbow unevenness can be suppressed, and further, the problem of strength and heat resistance of the polyester resin film can be solved due to insufficient crystallization.
  • the polyester resin film can be controlled so that the in-plane birefringence distribution falls within the ranges of the above formulas (3) and (4), and the rainbow unevenness becomes difficult to see.
  • DSC is an abbreviation for differential scanning calorimetry
  • the “pre-peak temperature” of DSC is the temperature of the peak that appears first when the polyester resin film is subjected to DSC measurement.
  • the DSC pre-peak temperature generally corresponds to the highest film surface temperature (heat setting temperature) of the polyester resin film at the time of heat setting during the transverse stretching step performed by uniaxial stretching of the polyester resin film.
  • the DSC pre-peak temperature is a value obtained by a conventional method in differential scanning calorimetry (DSC).
  • the density of the polyester resin film of the present invention is preferably 1.370 to 1.390 g / cm 3 , more preferably 1.372 to 1.388 g / cm 3 , and 1.374 to 1.386 g. More preferably, it is / m 3 .
  • a density 1.370g / cm 3 or more it is possible to eliminate the film strength and heat resistance issues, With 1.390g / cm 3 or less, rainbow unevenness is hardly visible.
  • the density can be measured according to JIS K7112.
  • the thermal shrinkage in the MD direction and TD direction of the polyester resin film after standing at 150 ° C. for 30 minutes is preferably 3.5% or less, more preferably 3% or less. More preferably, it is 5% or less.
  • the thermal shrinkage rate is set to 3.5% or less, the shrinkage of the polyester resin film is suppressed when used in a liquid crystal display device or a touch panel, and display failure is less likely to occur.
  • the heat shrinkage rate in the MD direction of the film after standing at 150 ° C. for 30 minutes is defined as follows. Two reference lines are put in advance in a sample piece M of a polyester resin film cut in 30 mm in the TD direction and 120 mm in the MD direction so as to have an interval of 100 mm in the MD direction in advance. After leaving the sample piece M in a heating oven at 150 ° C. for 30 minutes under no tension, the sample piece M is cooled to room temperature, and the interval between the two reference lines is measured. The interval after processing measured at this time is A [mm]. The numerical value [%] calculated by using the formula “100 ⁇ (100 ⁇ A) / 100” from the interval 100 mm before the processing and the interval Amm after the processing is used as the MD thermal contraction rate (S ).
  • the thermal shrinkage rate in the TD direction of the film after standing at 150 ° C. for 30 minutes is defined as follows. Two reference lines are put in advance in a sample piece M of a polyester resin film cut in 30 mm in the MD direction and 120 mm in the TD direction so as to have an interval of 100 mm in the TD direction. After leaving the sample piece M in a heating oven at 150 ° C. for 30 minutes under no tension, the sample piece M is cooled to room temperature, and the interval between the two reference lines is measured. The interval after processing measured at this time is A [mm]. The numerical value [%] calculated by using the formula “100 ⁇ (100 ⁇ A) / 100” from the interval 100 mm before the processing and the interval Amm after the processing is used as the TD thermal contraction rate (S ).
  • the film conveyance direction is also referred to as MD (Machine Direction) direction.
  • the MD direction of the film is also referred to as the longitudinal direction of the film.
  • the film width direction is a direction orthogonal to the longitudinal direction.
  • the film width direction is also called a TD (Transverse Direction) direction in a film manufactured while transporting the film.
  • the film width direction is referred to as TD or TD direction
  • the direction orthogonal to the film width direction is referred to as MD or MD direction.
  • the heat shrinkage in the MD direction is also referred to as MD heat shrinkage, and the ratio is referred to as MD heat shrinkage rate. Therefore, the thermal contraction rate in the direction orthogonal to the film width direction is also expressed as MD thermal contraction rate.
  • the thermal shrinkage in the MD direction and TD direction of the polyester resin film after standing at 80 ° C. for 24 hours is preferably 0.3% or less, more preferably 0.2% or less, More preferably, it is 0.15% or less.
  • the thermal shrinkage rate is set to 0.3% or less, the shrinkage of the polyester resin film is suppressed when used for a liquid crystal display device or a touch panel, and display failure is less likely to occur.
  • the thermal shrinkage rate in the MD direction of the film after standing at 80 ° C. for 24 hours is defined as follows. Two reference lines are put in advance in a sample piece M of a polyester resin film cut in 30 mm in the TD direction and 120 mm in the MD direction so as to have an interval of 100 mm in the MD direction in advance. After leaving the sample piece M in a heating oven at 80 ° C. under no tension for 24 hours, the sample piece M is cooled to room temperature, and the interval between the two reference lines is measured. The interval after processing measured at this time is A [mm]. The numerical value [%] calculated by using the formula “100 ⁇ (100 ⁇ A) / 100” from the interval 100 mm before the processing and the interval Amm after the processing is used as the MD thermal contraction rate (S ).
  • the thermal shrinkage rate in the TD direction of the film after standing at 80 ° C. for 24 hours is defined as follows. Two reference lines are put in advance in a sample piece M of a polyester resin film cut in 30 mm in the MD direction and 120 mm in the TD direction so as to have an interval of 100 mm in the TD direction. After leaving the sample piece M in a heating oven at 80 ° C. under no tension for 24 hours, the sample piece M is cooled to room temperature, and the interval between the two reference lines is measured. The interval after processing measured at this time is A [mm]. The numerical value [%] calculated by using the formula “100 ⁇ (100 ⁇ A) / 100” from the interval 100 mm before the processing and the interval Amm after the processing is used as the TD thermal contraction rate (S ).
  • the width of the polyester resin film of the present invention is preferably 0.6 to 6 m, more preferably 0.8 to 5.6 m, and further preferably 1.0 to 3.0 m.
  • the polyester resin film of the present invention has a non-uniformity (hereinafter also referred to as width-direction orientation angle unevenness) of 15 ° or less as a difference between the maximum value and the minimum value of the orientation angle in the film width direction. It is preferable from the viewpoint that the shrinkage rate unevenness does not become excessively large and the film is difficult to break in the subsequent process.
  • the orientation angle unevenness in the width direction is more preferably 12 ° or less, further preferably 10 ° or less, and most preferably 8 ° or less.
  • the polyester resin film of the present invention is preferably biaxially oriented. Specifically, the polyester resin film of the present invention preferably has a refractive index in the longitudinal direction of 1.590 or less and a crystallinity exceeding 5%. The degree of crystallinity of the polyester resin film of the present invention is preferably 5% or more, more preferably 20% or more, and further preferably 30% or more.
  • the polyester resin film of the present invention contains a polyester resin.
  • the polyester resin film of the present invention may be a single layer film having a polyester resin as a main component, or may be a multilayer film having at least one layer having a polyester resin as a main component.
  • the surface treatment may be performed on both surfaces or one surface of these single layer films or multilayer films, and this surface treatment is performed by corona treatment, saponification treatment, heat treatment, ultraviolet irradiation, electron beam irradiation, or the like. Modification may be sufficient, and thin film formation by application
  • the mass ratio of the polyester resin in the entire film is usually 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more.
  • polyester resin one having a composition of [0042] of WO2012 / 157762 is preferably used.
  • polyester polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polycyclohexanedimethylene terephthalate (PCT), etc.
  • PET and PEN are more preferable because of cost and heat resistance. More preferably, it is PET (PEN has a slight Re / Rth, that is, in-plane retardation / thickness direction retardation tends to be small).
  • Polyester is most preferably polyethylene terephthalate, but polyethylene naphthalate can also be preferably used. For example, those described in JP-A-2008-39803 can be preferably used.
  • Polyethylene terephthalate is a polyester having a structural unit derived from terephthalic acid as a dicarboxylic acid component and a structural unit derived from ethylene glycol as a diol component, and 80 mol% or more of all repeating units are preferably ethylene terephthalate.
  • the structural unit derived from other copolymerization components may be included.
  • copolymer components include isophthalic acid, p- ⁇ -oxyethoxybenzoic acid, 4,4′-dicarboxydiphenyl, 4,4′-dicarboxybenzophenone, bis (4-carboxyphenyl) ethane, adipic acid , Dicarboxylic acid components such as sebacic acid, 5-sodium sulfoisophthalic acid, 1,4-dicarboxycyclohexane, propylene glycol, butanediol, neopentyl glycol, diethylene glycol, cyclohexanediol, bisphenol A ethylene oxide adduct, polyethylene glycol And diol components such as polypropylene glycol and polytetramethylene glycol.
  • Dicarboxylic acid components such as sebacic acid, 5-sodium sulfoisophthalic acid, 1,4-dicarboxycyclohexane, propylene glycol, butanediol
  • dicarboxylic acid components and diol components can be used in combination of two or more if necessary.
  • an oxycarboxylic acid such as p-oxybenzoic acid can be used in combination with the carboxylic acid component or diol component.
  • a dicarboxylic acid component and / or a diol component containing a small amount of an amide bond, a urethane bond, an ether bond, a carbonate bond, or the like may be used.
  • Polyethylene terephthalate can be produced by a direct polymerization method in which terephthalic acid and ethylene glycol and, if necessary, other dicarboxylic acid and / or other diol are directly reacted, dimethyl ester of terephthalic acid and ethylene glycol, and necessary
  • any production method such as a so-called transesterification method in which a dimethyl ester of another dicarboxylic acid and / or another diol is transesterified can be applied.
  • the intrinsic viscosity IV of the polyester resin is preferably 0.5 or more and 0.9 or less, more preferably 0.52 or more and 0.8 or less, and still more preferably Is 0.54 or more and 0.7 or less.
  • solid phase polymerization may be used in combination with the melt polymerization described later when the polyester resin is synthesized.
  • the acetaldehyde content of the polyester resin is preferably 50 ppm or less. More preferably, it is 40 ppm or less, Most preferably, it is 30 ppm or less. Acetaldehyde easily causes a condensation reaction between acetaldehydes, and water is generated as a side reaction product, which may cause hydrolysis of the polyester. The lower limit of the acetaldehyde content is practically about 1 ppm.
  • (1-3) Catalyst For the polymerization of the polyester resin, Sb, Ge, Ti, Al-based catalysts are used, preferably Sb, Ti, Al-based catalysts, and more preferably Al-based catalysts. That is, it is preferable that the polyester resin used as the raw material resin is polymerized using an aluminum catalyst.
  • an Al-based catalyst Re (in-plane retardation) is more easily expressed than when other catalysts (for example, Sb, Ti) are used, and PET can be thinned. That is, it means that the Al-based catalyst is more easily oriented. This is presumed to be due to the following reasons.
  • the Al-based catalyst has a lower reactivity (polymerization activity) than Sb and Ti, the reaction is mild, and a by-product (diethylene glycol unit: DEG) is hardly generated. As a result, the regularity of PET increases, and it is easy to be oriented and to develop in-plane birefringence.
  • Al-based catalyst As the Al-based catalyst, those described in [0013] to [0148] of WO2011 / 040161 ([0021] to [0123] of US2012 / 0183761) are used. The contents described in these publications are incorporated herein by reference.
  • the method for polymerizing the polyester resin using the Al-based catalyst is not particularly limited, but specifically, [0091] to [0094] of WO2012 / 008488 ([0144] to US2013 / 0112271) [0153]) can be used to polymerize according to these publications, the contents of which are incorporated herein.
  • Such Al-based catalysts include, for example, [0052] to [0054], [0099] to [0104] of JP2012-122051 ([0045] to [0047], [0091] of WO2012 / 029725. To [0096]) can be prepared according to these publications, and the contents described in these publications are incorporated herein.
  • the amount of the Al-based catalyst is preferably 3 to 80 ppm, more preferably 5 to 60 ppm, and still more preferably 5 to 40 ppm as the amount of Al element with respect to the mass of the polyester resin.
  • Sb-based catalyst As the Sb-based catalyst, those described in JP-A-2012-41519, [0050], [0052] to [0054] can be used.
  • the method for polymerizing the polyester resin using the Sb-based catalyst is not particularly limited. Specifically, the polymerization can be performed according to [0086] to [0087] of WO2012 / 157762.
  • additive It is also preferable to add a known additive to the polyester resin film of the present invention.
  • a known additive include ultraviolet absorbers, particles, lubricants, antiblocking agents, heat stabilizers, antioxidants, antistatic agents, light resistance agents, impact resistance improvers, lubricants, dyes, pigments and the like.
  • the polyester resin film generally requires transparency, it is preferable to keep the additive amount to a minimum.
  • the polyester resin film of the present invention may contain an ultraviolet absorber in order to prevent the liquid crystal or the like of the liquid crystal display from being deteriorated by ultraviolet rays.
  • the ultraviolet absorber is not particularly limited as long as it is a compound having ultraviolet absorbing ability and can withstand the heat applied in the production process of the polyester resin film.
  • As the ultraviolet absorber there are an organic ultraviolet absorber and an inorganic ultraviolet absorber. From the viewpoint of transparency, an organic ultraviolet absorber is preferable. Those described in [0057] of WO2012 / 157762 and cyclic iminoester-based ultraviolet absorbers described later can be used.
  • the cyclic imino ester-based ultraviolet absorber is not limited to the following, and examples thereof include 2-methyl-3,1-benzoxazin-4-one and 2-butyl-3,1-benzoxazine-4. -One, 2-phenyl-3,1-benzoxazin-4-one, 2- (1- or 2-naphthyl) -3,1-benzoxazin-4-one, 2- (4-biphenyl) -3, 1-benzoxazin-4-one, 2-p-nitrophenyl-3,1-benzoxazin-4-one, 2-m-nitrophenyl-3,1-benzoxazin-4-one, 2-p-benzoyl Phenyl-3,1-benzoxazin-4-one, 2-p-methoxyphenyl-3,1-benzoxazin-4-one, 2-o-methoxyphenyl-3,1-benzoxazin-4-one 2-cyclohexyl-3,1-benzoxazin-4-one, 2-
  • a benzoxazinone-based compound which is difficult to be yellowed is preferably used.
  • a compound represented by the following general formula (1) is more preferably used. It is done.
  • R represents a divalent aromatic hydrocarbon group
  • X 1 and X 2 are each independently selected from hydrogen or the following functional group group, but are not necessarily limited thereto. Absent.
  • 2,2 ′-(1,4-phenylene) bis (4H-3,1-benzoxazin-4-one) is particularly preferable in the present invention.
  • the amount of the ultraviolet absorber to be contained in the polyester resin film of the present invention is usually 10.0% by mass or less, preferably 0.3 to 3.0% by mass.
  • the ultraviolet absorber may bleed out on the surface, which may cause deterioration of surface functionality such as adhesion deterioration.
  • the ultraviolet absorber is preferably blended in the intermediate layer.
  • this compound can be prevented from bleeding out to the film surface, and as a result, characteristics such as film adhesion can be maintained.
  • the masterbatch method described in [0050] to [0051] of WO2011 / 162198 can be used for these formulations.
  • the method for producing a polyester resin film of the present invention includes a step of melt-extruding a polyester raw material resin into a sheet shape, cooling on a casting drum to form a polyester resin film, and longitudinally stretching the formed polyester resin film in the longitudinal direction.
  • 15 ⁇ m ⁇ Th ′ ⁇ 60 ⁇ m Formula (1 ′) 2.8 ⁇ DMD ⁇ 3.6 Formula (6)
  • Formula (8) 80 ° C. ⁇ TTDs ⁇ 120 ° C.
  • Formula (9) 120 ° C. ⁇ TTDe ⁇ 180 ° C.
  • Formula (10) 20 ° C. ⁇ TTDe ⁇ TTDs ⁇ 80 ° C.
  • Th ′ represents the thickness of the polyester resin film after the transverse stretching step, and the unit of the thickness of the polyester resin film after the transverse stretching step is ⁇ m;
  • DTD represents the draw ratio in the transverse direction
  • TSET represents the maximum surface temperature at the time of heat setting
  • TTDs represents the film surface temperature at the start of transverse stretching
  • TTDe is the end of transverse stretching Represents the film surface temperature of the hour; units of TSET, TTDs, and TTDe are in ° C.
  • the method for producing a polyester resin film of the present invention includes a preheating portion for preheating the polyester resin film after longitudinal stretching to a temperature at which the polyester resin film can be stretched, and stretching the preheated polyester resin film in the width direction perpendicular to the longitudinal direction.
  • the heat-fixed part that heats and crystallizes the stretched part, the longitudinally stretched and the laterally stretched polyester resin film, and heat-sets, heats the polyester resin film that is heat-fixed, and relaxes the tension of the polyester resin film It is preferable to convey the polyester resin film in this order to a heat relaxation part for removing residual distortion of the film and a cooling part for cooling the polyester resin film after heat relaxation.
  • the draw ratio in the machine direction and the transverse direction are within a specific range, and the highest reached film surface temperature at the time of heat setting, the film surface temperature at the start of transverse stretching, and the end of transverse stretching.
  • polyester resin film of this invention can be manufactured by a well-known method.
  • the preferable aspect of the manufacturing method of the polyester resin film of this invention is demonstrated.
  • the unstretched polyester resin film is preferably formed into a film by melt-extruding the polyester resin. It is preferable to dry the polyester resin or the master batch of the polyester resin and additive produced by the above-described master batch method to a moisture content of 200 ppm or less, and then introduce the melt into a single or twin screw extruder and melt it. At this time, in order to suppress degradation of the polyester, it is also preferable to melt in nitrogen or vacuum.
  • the detailed conditions can be implemented in accordance with these publications with the aid of Patent Nos. 4992661 [0051] to [0052] (US 2013/0100378 publication [0085] to [0086]) and are described in these publications. The contents are incorporated herein. Furthermore, it is also preferable to use a gear pump in order to increase the delivery accuracy of the molten resin (melt). It is also preferable to use a 3 ⁇ m to 20 ⁇ m filter for removing foreign substances.
  • melt containing the polyester resin melt-kneaded from the die it may be extruded as a single layer or as a multilayer.
  • a layer containing an ultraviolet grade agent (UV agent) and a layer not containing it may be laminated.
  • UV agent ultraviolet grade agent
  • the bleed-out UV agent is undesirably easily transferred to a pass roll in the film-forming process, increasing the coefficient of friction between the film and the roll, and causing scratches.
  • the thickness of the inner layer (ratio to the total layer) of the obtained polyester resin film is preferably 50% to 95%, more preferably 60% to 90%. More preferably, it is 70% or more and 85% or less.
  • Such lamination can be performed by using a feed block die or a multi-manifold die.
  • the refractive index in the longitudinal direction of the unstretched polyester resin film is preferably 1.590 or less, more preferably 1.585 or less, and further preferably 1.580 or less.
  • the crystallinity of the unstretched polyester resin film is preferably 5% or less, more preferably 3% or less, and even more preferably 1% or less.
  • the crystallinity degree of the unstretched polyester resin film here means the crystallinity degree of the center part of a film width direction.
  • a polymer layer (preferably an easy-adhesion layer) may be formed by coating before or after stretching described later.
  • the polymer layer generally include a functional layer that the polarizing plate may have, and among them, it is preferable to form an easy adhesion layer as the polymer layer.
  • the easy-adhesion layer can be applied by the method described in [0062] to [0070] of WO2012 / 157762.
  • the production method of the present invention includes a longitudinal stretching step of longitudinally stretching the molded polyester resin film in the longitudinal direction.
  • the longitudinal stretching of the film is performed, for example, by applying tension between two or more pairs of nip rolls arranged in the film conveyance direction while passing the film through a pair of nip rolls sandwiching the film and conveying the film in the longitudinal direction of the film. be able to.
  • the rotational speed of the nip roll B on the downstream side is By making it faster than the rotational speed of the nip roll A on the upstream side, the film is stretched in the transport direction (MD direction).
  • Two or more pairs of nip rolls may be installed independently on the upstream side and the downstream side, respectively.
  • the stretching ratio in the longitudinal direction of the polyester resin film satisfies the following formula (6), preferably satisfies the following formula (6-2), and more preferably satisfies the following formula (6-3). . 2.8 ⁇ DMD ⁇ 3.6 Formula (6) 2.9 ⁇ DMD ⁇ 3.5 Formula (6-2) 3.0 ⁇ DMD ⁇ 3.4 Formula (6-3)
  • DMD represents the stretching ratio in the longitudinal direction.
  • the area stretch ratio represented by the product of the longitudinal and lateral stretch ratios is preferably 6 to 18 times, more preferably 8 to 16 times, more preferably 9 to 15 times the area of the polyester resin film before stretching. More preferably, it is double.
  • the temperature during the longitudinal stretching of the polyester resin film (hereinafter also referred to as “longitudinal stretching temperature”) is preferably Tg ⁇ 20 ° C. or more and Tg + 50 ° C. or less when the glass transition temperature of the polyester resin film is Tg. It is preferably Tg-10 ° C. or higher and Tg + 40 ° C. or lower, more preferably Tg ° C. or higher and Tg + 30 ° C. or lower.
  • the polyester resin film in contact with the roll is heated by providing a pipe that can flow a heater or a hot solvent inside the roll. can do.
  • a polyester resin film can be heated by spraying a warm air on a polyester resin film, making it contact with heat sources, such as a heater, or letting the vicinity of a heat source pass.
  • the polyester resin film is at least 2 in the longitudinal direction (conveying direction, MD) of the polyester resin film and the direction (TD direction) orthogonal to the longitudinal direction of the polyester resin film. It will stretch to the axis. The stretching in the MD direction and the TD direction may be performed at least once each.
  • the direction (TD) orthogonal to the longitudinal direction (conveyance direction, MD) of a polyester resin film intends the direction perpendicular
  • a direction in which the angle with respect to the longitudinal direction (that is, the conveyance direction) can be regarded as 90 ° due to mechanical errors or the like (for example, a direction of 90 ° ⁇ 5 ° with respect to the MD direction) is included.
  • the biaxial stretching method may be any of a sequential biaxial stretching method in which longitudinal stretching and lateral stretching are separated and a simultaneous biaxial stretching method in which longitudinal stretching and lateral stretching are simultaneously performed.
  • the longitudinal stretching and the lateral stretching may be independently performed twice or more, and the order of the longitudinal stretching and the lateral stretching is not limited.
  • stretching modes such as longitudinal stretching ⁇ transverse stretching, longitudinal stretching ⁇ transverse stretching ⁇ longitudinal stretching, longitudinal stretching ⁇ longitudinal stretching ⁇ transverse stretching, transverse stretching ⁇ longitudinal stretching can be mentioned. Of these, longitudinal stretching ⁇ transverse stretching is preferred.
  • the birefringence of the film after longitudinal stretching and before lateral stretching preferably satisfies the following formula (12), more preferably satisfies the following formula (12-2), and satisfies the following formula (12-3). Further preferred.
  • nx (MD) represents the refractive index in the slow axis direction in the plane of the polyester resin film after longitudinal stretching
  • ny (MD) represents the fast axis direction in the plane of the polyester resin film after longitudinal stretching.
  • Expression (12) exceeds 0.030 and is equal to or less than 0.090, control within the predetermined range in Expressions (2) to (4) can be performed, and rainbow unevenness becomes difficult to see.
  • the birefringence of the film after longitudinal stretching and before lateral stretching preferably satisfies the following formula (13) in addition to satisfying the above formula (12), and preferably satisfies the following formula (13-2): It is more preferable that the following formula (13-3) is satisfied.
  • nx (MD) represents the refractive index in the slow axis direction in the plane of the polyester resin film after longitudinal stretching
  • ny (MD) represents the fast axis direction in the plane of the polyester resin film after longitudinal stretching
  • nz (MD) represents the refractive index in the thickness direction of the polyester resin film after longitudinal stretching. If the expression (13) is 0.030 or more and less than 0.090, it becomes possible to control within the predetermined range in the above expressions (2) to (4), and the rainbow unevenness becomes difficult to see.
  • nx (MD), ny (MD), and nz (MD) can be measured by the same method as the above nx, ny, and nz.
  • the polyester resin film after longitudinal stretching is stretched in the width direction perpendicular to the longitudinal direction.
  • the transverse stretching step in the present invention is a step of transversely stretching the polyester resin film after longitudinal stretching in the width direction orthogonal to the longitudinal direction.
  • A a preheating portion for preheating the polyester resin film after longitudinal stretching to a temperature at which it can be stretched;
  • B a stretched part that stretches the preheated polyester resin film in a transverse direction by applying tension to the width direction perpendicular to the longitudinal direction;
  • C a heat fixing part for heating and crystallizing the heat-fixed polyester resin film after the longitudinal stretching and the transverse stretching;
  • D a heat relaxation portion that heats the heat-fixed polyester resin film, relaxes the tension of the polyester resin film, and removes residual strain of the film; and
  • E It is preferable to convey a polyester resin film in this order to the cooling part which cools the polyester resin film after heat relaxation.
  • the specific means is not limited as long as the polyester resin film is transversely stretched in the above configuration, but a lateral stretching apparatus or biaxial capable of processing each step constituting the above configuration. It is preferable to use a stretching machine.
  • the biaxial stretching machine 100 includes a pair of annular rails 60a and 60b, and gripping members 2a to 2l attached to the respective annular rails and movable along the rails.
  • the annular rails 60a and 60b are arranged symmetrically with respect to the polyester resin film 200, and can be stretched in the film width direction by holding the polyester resin film 200 with the gripping members 2a to 2l and moving along the rails. It is like that.
  • FIG. 1 is a top view showing an example of a biaxial stretching machine from the top.
  • the biaxial stretching machine 100 includes a preheating unit 10 that preheats the polyester resin film 200 and a stretching unit that stretches the polyester resin film 200 in the arrow TD direction, which is a direction orthogonal to the arrow MD direction, and applies tension to the polyester resin film. 20, a heat fixing portion 30 for heating the tensioned polyester resin film while applying tension, and a heat relaxation portion 40 for relaxing the tension of the heat-fixed polyester resin film by heating.
  • the cooling part 50 which cools the polyester resin film which passed through the heat relaxation part is comprised.
  • Grip members 2a, 2b, 2e, 2f, 2i, and 2j that are movable along the annular rail 60a are attached to the annular rail 60a, and the annular rail 60b is movable along the annular rail 60b.
  • Gripping members 2c, 2d, 2g, 2h, 2k, and 2l are attached.
  • the grip members 2a, 2b, 2e, 2f, 2i, and 2j grip one end of the polyester resin film 200 in the TD direction, and the grip members 2c, 2d, 2g, 2h, 2k, and 2l are polyester resins. The other end of the film 200 in the TD direction is gripped.
  • the gripping members 2a to 2l are generally called chucks, clips, and the like.
  • the gripping members 2a, 2b, 2e, 2f, 2i, and 2j move counterclockwise along the annular rail 60a, and the gripping members 2c, 2d, 2g, 2h, 2k, and 2l move along the annular rail 60b. Move clockwise.
  • the gripping members 2a to 2d grip the end portion of the polyester resin film 200 in the preheating portion 10 and move along the annular rail 60a or 60b while being gripped, and the extending portion 20 and the gripping members 2e to 2h are located. It proceeds through the thermal relaxation section 40 to the cooling section 50 where the gripping members 2i to 2l are located. Thereafter, the gripping members 2a and 2b and the gripping members 2c and 2d are separated from the end of the polyester resin film 200 at the end of the cooling unit 50 on the downstream side in the MD direction in the transport direction, and then the annular rail 60a or It moves along 60b and returns to the preheating part 10.
  • the polyester resin film 200 moves in the direction of the arrow MD, and sequentially preheats in the preheating unit 10, stretches in the stretching unit 20, heat fixing in the heat fixing unit 30, heat relaxation in the heat relaxation unit 40, Cooling in the cooling unit 50 is performed and transverse stretching is performed.
  • the moving speed of the gripping members 2a to 2l in each region such as the preheating portion becomes the conveying speed of the polyester resin film 200.
  • the gripping members 2a to 2l can change the moving speed independently of each other.
  • the biaxial stretching machine 100 enables transverse stretching in which the polyester resin film 200 is stretched in the TD direction in the stretching unit 20, but the polyester resin film can be changed by changing the moving speed of the gripping members 2a to 2l. 200 can also be stretched in the MD direction. That is, simultaneous biaxial stretching can be performed using the biaxial stretching machine 100.
  • the gripping member for gripping the end portion in the TD direction of the polyester resin film 200 is only 2a to 2l in FIG. 1, but in order to support the polyester resin film 200, the biaxial stretching machine 100 is not limited to 2a to 2l.
  • a gripping member (not shown) is attached.
  • the gripping members 2a to 21 may be collectively referred to as “grip member 2”.
  • the polyester resin film after longitudinal stretching in the longitudinal stretching step is preheated to a temperature at which stretching is possible.
  • the polyester resin film 200 is preheated in the preheating unit 10.
  • the polyester resin film 200 is heated in advance before being stretched so that the polyester resin film 200 can be easily stretched laterally.
  • the film surface temperature at the end point of the preheating part (hereinafter also referred to as “preheating temperature”) is preferably Tg ⁇ 10 ° C. to Tg + 60 ° C., where Tg is the glass transition temperature of the polyester resin film 200, and Tg ° C. It is more preferable that Tg + 50 ° C.
  • the end point of the preheating portion refers to the time when the preheating of the polyester resin film 200 is finished, that is, the position where the polyester resin film 200 is separated from the region of the preheating portion 10.
  • the polyester resin film preheated in the preheating portion is stretched in the transverse direction with tension in the width direction (TD direction) perpendicular to the longitudinal direction (MD direction).
  • the preheated polyester resin film 200 is laterally stretched at least in the TD direction orthogonal to the longitudinal direction of the polyester resin film 200 to give tension to the polyester resin film 200.
  • Stretching (lateral stretching) in the direction (TD) perpendicular to the longitudinal direction (conveying direction, MD) of the polyester resin film 200 is an angle perpendicular to the longitudinal direction (conveying direction, MD) of the polyester resin film 200 (90 °).
  • the direction may be in the range of mechanical error.
  • the range of the mechanical error is a direction at an angle (90 ° ⁇ 5 °) that can be regarded as perpendicular to the longitudinal direction (conveying direction, MD) of the polyester.
  • the stretch ratio (stretch ratio in the transverse direction) of the polyester resin film 200 satisfies the following formula (7), preferably satisfies the following formula (7-2), It is more preferable to satisfy.
  • Formula (7-3) DMD represents the stretching ratio in the longitudinal direction
  • DTD represents the stretching ratio in the transverse direction.
  • the area stretch ratio (product of each stretch ratio) of the polyester resin film 200 is preferably 6 to 18 times, more preferably 8 to 16 times the area of the polyester resin film 200 before stretching. Preferably, it is 9 to 15 times.
  • the film surface temperature at the start of transverse stretching of the polyester resin film 200 satisfies the following formula (9), preferably satisfies the following formula (9-2), and more preferably satisfies the following formula (9-3).
  • Formula (9) 85 ° C. ⁇ TTDs ⁇ 115 ° C.
  • Formula (9-2) 90 ° C. ⁇ TTDs ⁇ 110 ° C.
  • TTDs represents the film surface temperature at the start of transverse stretching (unit: ° C.).
  • the film surface temperature at the end of the transverse stretching of the polyester resin film 200 satisfies the following formula (10), preferably satisfies the following formula (10-2), and more preferably satisfies the following formula (10-3). preferable. 120 ° C. ⁇ TTDe ⁇ 180 ° C. Formula (10) 125 ° C. ⁇ TTDe ⁇ 170 ° C. Formula (10-2) 130 ° C. ⁇ TTDe ⁇ 160 ° C. Formula (10-3)
  • TTDe represents the film surface temperature at the end of transverse stretching (unit: ° C.).
  • the difference (TTDe ⁇ TTDs) between the film surface temperature at the end of the lateral stretching of the polyester resin film 200 and the film surface temperature at the start of the lateral stretching of the polyester resin film 200 satisfies the following formula (11), 11-2) is preferably satisfied, and it is more preferable that the following formula (11-3) is satisfied.
  • Formula (11-2) 30 ° C. ⁇ TTDe ⁇ TTDs ⁇ 60 ° C.
  • TTDs represents the film surface temperature at the start of transverse stretching (unit: ° C)
  • TTDe represents the film surface temperature at the end of transverse stretching (unit: ° C). If the difference is 20 ° C. or more or 80 ° C. or less, it is easy to control the in-plane birefringence distribution in the formula (4) to a predetermined range, and rainbow unevenness is difficult to see.
  • the movement speeds of the gripping members 2a to 2l can be changed independently. Therefore, for example, by increasing the moving speed of the gripping member 2 on the downstream side in the MD direction of the stretching section 20 such as the stretching section 20 and the heat fixing section 30 rather than the moving speed of the gripping member 2 in the preheating section 10, the polyester resin film It is also possible to perform longitudinal stretching in which 200 is stretched in the transport direction (MD direction).
  • the longitudinal stretching of the polyester resin film 200 in the lateral stretching step may be performed only by the stretching unit 20, or may be performed by the heat fixing unit 30, the thermal relaxation unit 40, or the cooling unit 50 described later. You may longitudinally stretch in several places.
  • (C. Heat fixing part) In the heat setting section, the polyester resin film that has already been subjected to longitudinal stretching and lateral stretching is heated and crystallized to be heat-set.
  • the heat setting means that the polyester resin film 200 is heated in the stretched portion 20 while being tensioned to crystallize the polyester.
  • the maximum reached film surface temperature of the surface of the polyester resin film 200 with respect to the tensioned polyester resin film 200 (in this specification, “TSET”, “heat fixing temperature”) Also satisfies the following formula (8), preferably satisfies the following formula (8-2), and more preferably satisfies the following formula (8-3).
  • TSET represents the maximum film surface temperature at the time of heat setting (unit: ° C).
  • TSET represents the maximum film surface temperature at the time of heat setting (unit: ° C).
  • the maximum film surface temperature is a value measured by bringing a thermocouple into contact with the surface of the polyester resin film 200.
  • the variation in the maximum film surface temperature in the film width direction is 0.5 ° C. or higher and 10.0 ° C. or lower.
  • the variation in the maximum film surface temperature of the film is 0.5 ° C. or more, which is advantageous in terms of wrinkles during conveyance in the subsequent process, and the variation is 10.0 ° C. or less.
  • the variation in the maximum reached film surface temperature is more preferably 0.5 ° C. or more and 7.0 ° C. or less, further preferably 0.5 ° C. or more and 5.0 ° C. or less, for the same reason as described above. It is particularly preferably from 5 ° C to 4.0 ° C.
  • the heating of the film during heat setting may be performed only from one side of the film or from both sides.
  • the molded polyester resin film is cooled differently on one side and the opposite side, so the film is likely to curl easily It has become.
  • the surface temperature immediately after heating on the heating surface in heat setting is higher in the range of 0.5 ° C. or more and 5.0 ° C.
  • the temperature difference between the heated surface and the non-heated surface on the opposite side is more preferably in the range of 0.7 to 3.0 ° C, and 0.8 ° C or higher and 2.0 ° C. The following is more preferable.
  • the TD direction edge part of a polyester resin film is selectively radiatively heated with a heater in at least one of the heat fixing part 30 and the heat relaxation part 40. Unless such radiant heating is performed, the MD thermal shrinkage rate in the TD direction of the produced polyester resin film is not lowered, and the distribution of the MD thermal shrinkage rate and the amount of change in the MD thermal shrinkage rate are not reduced.
  • the radiant heating in the heat fixing unit 30 may be omitted, or may be performed in both the heat fixing unit 30 and the heat relaxation unit 40.
  • the end portion in the TD direction of the polyester resin film refers to the edge of both ends in the TD direction of the polyester resin film and the region from the edge to 10% of the total length (that is, the width) of the polyester resin film in the TD direction.
  • the heating of the end portion in the TD direction of the polyester resin film is performed using a heater capable of radiation heating, and at least one end portion in the TD direction of the polyester resin film is selectively heated. From the viewpoint of suppressing local MD heat shrinkage, it is preferable to heat both ends of the polyester resin film in the TD direction.
  • “selectively heating” means that the entire film including the end of the polyester resin film is not heated but the film end is locally heated.
  • a heater capable of radiation heating for example, an infrared heater can be mentioned, and it is particularly preferable to use a ceramic heater (ceramic heater).
  • the heating of the end portion in the TD direction of the polyester resin film is preferably performed by adjusting the surface temperature of the heater and the distance (linear distance) between the polyester resin film surface and the heater.
  • the surface temperature of the heater is 300 ° C. to 800 ° C.
  • the distance between the polyester resin film surface and the heater is preferably 20 mm to 250 mm
  • the heater surface temperature is 400 ° C. to 700 ° C.
  • the distance is more preferably 50 mm to 200 mm.
  • the temperature variation in the film TD direction when radiant heating is performed, it is preferable to narrow the temperature variation in the film TD direction to a range of 0.7 ° C. or more and 3.0 ° C. or less, and thereby the variation in crystallinity in the film width direction is 0.5% or more. It can be reduced to a range of up to 3.0%. If it does in this way, the local increase / decrease in MD thermal contraction rate can be suppressed, generation
  • the residence time in the heat setting part is 5 seconds or more and 50 seconds or less.
  • the residence time is the time during which the state in which the film is heated in the heat fixing part is continued.
  • the residence time is 5 seconds or longer, the change in crystallinity with respect to the heating time is small, and therefore, it is advantageous in that unevenness of crystallinity in the width direction is relatively less likely to occur. This is advantageous in terms of productivity because it is not necessary to extremely reduce the line speed.
  • the residence time is preferably 8 seconds or longer and 40 seconds or shorter, and more preferably 10 seconds or longer and 30 seconds or shorter, for the same reason as described above.
  • the polyester resin film end is radiantly heated in at least one of the heat fixing part and the heat relaxation part.
  • selective radiant heating may be performed. Radiant heating to the end of the polyester resin film in the TD direction reduces the temperature variation in the TD direction of the film, and hence the variation in crystallinity, and makes it easy to suppress local increase and decrease in the MD thermal shrinkage rate.
  • the heat-fixed polyester resin film is heated to relieve the tension of the polyester resin film and remove the residual distortion of the film.
  • the end portion in the TD direction of the polyester resin film is selectively radiantly heated by the heater.
  • the selective radiant heating of the end portion in the TD direction of the polyester resin film at the heat relaxation portion may be performed in the same manner as the selective radiant heating of the end portion in the TD direction of the polyester resin film at the heat fixing portion.
  • the numerical range and preferred embodiments are also the same.
  • heat relaxation is to heat the polyester resin film that has been heat-fixed to relieve the tension of the polyester resin film, and it is preferable to heat the polyester resin film at the heat relaxation portion as follows. .
  • the maximum ultimate film surface temperature of the surface of the polyester resin film 200 is 5 ° C. or more lower than the maximum ultimate film surface temperature (TSET) of the polyester resin film 200 in the heat fixing part 30.
  • TSET maximum ultimate film surface temperature
  • the highest reached film surface temperature of the surface of the polyester resin film 200 during thermal relaxation is also referred to as “thermal relaxation temperature (T thermal relaxation )”.
  • the thermal relaxation temperature (T thermal relaxation ) is heated at a temperature lower by 5 ° C. or more (T thermal relaxation ⁇ TSET ⁇ 5 ° C.) than the heat fixing temperature (TSET) to release the tension (the stretching tension is reduced ).
  • T thermal relaxation is “TSET-5 ° C.” or less, the hydrolysis resistance of the polyester resin film is excellent.
  • TSET is preferably 100 ° C. or higher in that the dimensional stability is improved.
  • T thermal relaxation is preferably in a temperature range of 100 ° C. or higher and 15 ° C. or lower than TSET (100 ° C.
  • T thermal relaxation ⁇ TSET ⁇ 15 ° C. 110 ° C. or higher
  • the T heat relaxation is a value measured by bringing a thermocouple into contact with the surface of the polyester resin film 200.
  • the longitudinal relaxation rate ⁇ S in the thermal relaxation portion is preferably 1 to 10%, more preferably 2 to 9%, and further preferably 3 to 8%.
  • the longitudinal relaxation rate ⁇ L in the thermal relaxation portion is preferably 3 to 23%, more preferably 5 to 21%, and even more preferably 7 to 19%.
  • the thermal shrinkage rate in the lateral direction of the film is reduced, and when it is used as a liquid crystal display or touch panel, the shrinkage of the film is suppressed and the display failure is reduced.
  • the relaxation rate is set to 23% or less, relaxation unevenness is reduced and display failure is reduced.
  • the relaxation rate ⁇ S in the vertical direction can be obtained by the following equation
  • the relaxation rate ⁇ L in the horizontal direction can be obtained by the following equation.
  • L1 represents the maximum width (length in the TD direction) of the polyester resin film 200
  • L2 represents the width of the polyester resin film at the end of the cooling part where the polyester resin film is separated from the cooling part.
  • S1 represents the conveyance speed in the preheating part 10 of the polyester resin film 200
  • S2 represents the conveyance speed of the polyester resin film in the edge part of a cooling part.
  • L1 is the maximum length of the polyester resin film in the TD direction after the polyester resin film is widened in the TD direction at the stretched portion.
  • L2 is the width of the polyester resin film when the gripping members (the gripping members 2j and 2l in FIG. 1), which are located in the cooling section and grip the polyester resin film, release the polyester resin film.
  • S1 corresponds to the moving speed of a gripping member (2a to 2d in FIG. 1) that grips the polyester resin film and moves the edge of the annular rail.
  • S2 corresponds to the conveyance speed when the polyester resin film 200 exceeds the straight line connecting the P point and the Q point.
  • (E. Cooling part) In a cooling part, the polyester resin film after heat-relaxing in a heat relaxation part is cooled. As shown in FIG. 1, in the cooling part 50, the polyester resin film 200 which passed through the heat relaxation part 40 is cooled. By cooling the polyester resin film 200 heated by the heat fixing part 30 or the heat relaxation part 40, the shape of the polyester resin film 200 is fixed.
  • the temperature (hereinafter also referred to as “cooling temperature”) of the polyester at the cooling part outlet of the polyester resin film 200 in the cooling part 50 is lower than the glass transition temperature Tg + 50 ° C. of the polyester resin film 200.
  • the temperature is preferably 25 ° C to 110 ° C, more preferably 25 ° C to 95 ° C, and further preferably 25 ° C to 80 ° C.
  • the cooling unit outlet refers to an end of the cooling unit 50 when the polyester resin film 200 is separated from the cooling unit 50, and the holding member 2 that holds the polyester resin film 200 (in FIG. 1, the holding member 2j and the holding member 2j). 2l) refers to the position when the polyester resin film 200 is released.
  • the average cooling rate when the temperature of the surface (film surface) of the polyester resin film is cooled from 150 ° C. to 70 ° C. is preferably in the range of 2 ° C./second to 100 ° C./second.
  • an average cooling rate is calculated
  • the average cooling rate is more preferably 4 ° C./second to 80 ° C./second, and further preferably 5 ° C./second to 50 ° C./second.
  • thermocontrol means for heating or cooling the polyester resin film 200 in preheating, stretching, heat setting, heat relaxation, and cooling in the transverse stretching step, hot or cold air is blown on the polyester resin film 200, or polyester resin is used.
  • the film 200 may be brought into contact with the surface of a metal plate whose temperature can be controlled, or the film 200 is passed through the vicinity of the metal plate.
  • the method for producing a polyester resin of the present invention may include an intermediate cooling part between the laterally stretched part and the heat fixing part.
  • cooling is performed by the same method as that of the cooling unit.
  • the minimum film surface temperature of the film in the intermediate cooling section preferably satisfies the following formula (14), more preferably satisfies the following formula (14-2), and further preferably satisfies the following formula (14-3). . 30 ° C. ⁇ TMC ⁇ (TTDe ⁇ 10) ° C. Formula (14) 40 ° C. ⁇ TMC ⁇ (TTDe-30) ° C. Formula (14-2) 50 ° C. ⁇ TMC ⁇ (TTDe-50) ° C. Formula (14-3) In the formula, TMC represents the minimum film surface temperature (unit: ° C.), and TTDe represents the film surface temperature at the end of transverse stretching (unit: ° C.).
  • TMC minimum film surface temperature
  • the film is trimmed, slit, and thickened as necessary, and wound for recovery.
  • the thickness of the polyester resin film after the transverse stretching step preferably satisfies the following formula (1 ′), preferably satisfies the following formula (1′-2), and the following formula (1′-3): It is more preferable to satisfy.
  • Th ′ represents the thickness of the polyester resin film after the transverse stretching step, and the unit of the thickness of the polyester resin film after the transverse stretching step is ⁇ m.
  • the film width after being released from the clip is preferably 0.8 to 6 m from the viewpoint of efficiently securing the film product width and preventing the apparatus size from becoming excessive, and is preferably 1 to 5 m. Is more preferably 1 to 4 m.
  • an optical film that requires accuracy is usually formed with a thickness of less than 3 m.
  • the film formed into a wide film may be slit to preferably 2 or more, 6 or less, more preferably 2 or more and 5 or less, and still more preferably 3 or more and 4 or less, and then wound.
  • the film width after trimming or slit corresponds to the film width of the polyester resin film of the present invention, and 0 It is preferable to satisfy 6 to 6 m.
  • the thickness of the wound film is the same as [0049] of Japanese Patent No. 4926661. It is also preferable to bond a masking film before winding.
  • the polyester resin film of the present invention can be used for a hard coat film.
  • the hard coat film has a hard coat layer and the polyester resin film of the present invention as a transparent film.
  • the hard coat layer may be formed by either a wet coating method or a dry coating method (vacuum film formation), but is preferably formed by a wet coating method having excellent productivity.
  • hard coat layer for example, JP2013-45045A, JP2013-43352A, JP2012-232424A, JP2012-128157A, JP2011-131409A, JP JP2011-131404A, JP2011-126162A, JP2011-75705A, JP2009-286981, JP2009-263567, JP2009-75248, JP2007-. No.
  • the polyester resin film of the present invention can be used for a sensor film for a touch panel.
  • a hard coat layer and a transparent conductive layer are laminated on a polyester resin film.
  • a general method for forming the transparent conductive layer there are a PVD method such as a sputtering method, a vacuum deposition method, and an ion plating method, a CVD (Chemical Vapor Deposition) method, a coating method, and a printing method.
  • the material for forming the transparent conductive layer is not particularly limited, and examples thereof include indium / tin composite oxide (ITO), tin oxide, copper, silver, aluminum, nickel, chromium, and the like. May be formed in an overlapping manner.
  • the transparent conductive layer may be provided with an undercoat layer for improving transparency and optical characteristics before forming the transparent conductive layer.
  • a metal layer made of a single metal element or an alloy of two or more metal elements may be provided between the undercoat layer and the polyester resin film. It is desirable to use a metal selected from the group consisting of silicon, titanium, tin and zinc for the metal layer.
  • the polyester resin film of this invention can be used for a glass scattering prevention film.
  • a hard coat layer and an adhesive layer are laminated on a polyester resin film.
  • the pressure-sensitive adhesive layer may be formed by either a wet coating method or a dry coating method.
  • an acrylic pressure-sensitive adhesive composition such as a solvent-based acrylic polymer, a solvent-based acrylic syrup, a solvent-free acrylic syrup, or a solvent-free urethane acrylate can be used.
  • the polyester resin film of the present invention can be used in a touch panel.
  • at least one of the hard coat film of the present invention, the sensor film for touch panel of the present invention, and the glass scattering prevention film of the present invention can be used in the touch panel.
  • the touch panel includes a so-called touch sensor and a touch pad.
  • the layer structure of the touch panel sensor electrode part in the touch panel is a bonding method in which two transparent electrodes are bonded, a method in which transparent electrodes are provided on both surfaces of a single substrate, a single-sided jumper or a through-hole method, or a single-area layer method. But you can.
  • the projected capacitive touch panel is preferably AC (Alternating Current) drive than DC (Direct Current) drive, and more preferably a drive method in which the voltage application time to the electrodes is short.
  • the polyester resin film of the present invention can be used as a polarizing plate protective film.
  • the polarizing plate of the present invention includes a polarizer having polarizing performance and the polyester resin film of the present invention.
  • the polarizing plate of the present invention may further include a polarizing plate protective film such as a cellulose acylate film in addition to the polyester resin film of the present invention.
  • the shape of the polarizing plate was not only a polarizing plate in the form of a film piece cut to a size that can be incorporated into a liquid crystal display device as it is, but also produced in a long shape by continuous production and rolled up into a roll shape.
  • a polarizing plate of an embodiment (for example, an embodiment having a roll length of 2500 m or more or 3900 m or more) is also included.
  • the width of the polarizing plate is preferably 1470 mm or more.
  • a polarizer comprising PVA and the polyester resin film of the present invention can be bonded to prepare a polarizing plate. Under the present circumstances, it is preferable to make the said easily bonding layer contact PVA. Furthermore, it is also preferable to combine with a protective film having retardation as described in [0024] of WO2011 / 162198.
  • the polyester resin film of this invention can be used for an image display apparatus, and the polarizing plate containing the polyester resin film of this invention can be used as a polarizing plate of an image display apparatus.
  • the image display device of the present invention includes the polyester resin film of the present invention or the polarizing plate of the present invention.
  • Examples of the image display device include a liquid crystal display (LCD), a plasma display (PDP), an electroluminescence display (OELD or IELD), a field emission display (FED), a touch panel, and electronic paper.
  • These image display devices preferably include the polarizing plate of the present invention on the display screen side of the image display panel.
  • a method of bonding the polarizing plate to an image display device such as a liquid crystal display device a known method can be used.
  • a roll-to-panel manufacturing method can be used, which is preferable for improving productivity and yield.
  • the roll-to-panel manufacturing method is described in JP2011-48381, JP2009-175653, JP4628488, JP4729647, WO2012 / 014602, WO2012 / 014571, and the like. It is not limited.
  • the image display device it is preferable to use a light source having an emission spectrum having a continuous emission spectrum as the light source. This is because it becomes easy to eliminate rainbow unevenness as described in [0019] to [0020] of WO2011 / 162198.
  • a light source used in the image display device the one described in [0013] of WO2011 / 162198 is used.
  • the light sources described in [0014] to [0015] of WO 2011/162198 are not continuous light sources and are not preferable.
  • the image display device is an LCD
  • the configuration described in [0011] to [0012] of WO2011 / 162198 can be used as the liquid crystal display device (LCD).
  • the liquid crystal display device using the polyester resin film of the present invention and / or the polarizing plate of the present invention preferably uses a white light source having a continuous emission spectrum, thereby using a discontinuous (bright line) light source.
  • Rainbow unevenness can be reduced more effectively than in the case. This is due to the reason similar to this reason, with the reason described in [0015] to [0027] of Patent No. 4888853 ([0029] to [0041] of US2012 / 0229732).
  • the contents described in these publications are incorporated herein.
  • the liquid crystal display device preferably includes the polarizing plate of the present invention and a liquid crystal display element.
  • the liquid crystal display element is typically a liquid crystal panel having a liquid crystal cell in which liquid crystal is sealed between upper and lower substrates and displaying an image by changing the alignment state of the liquid crystal by applying a voltage.
  • the polarizing plate of the present invention can be applied to various known displays such as a display panel, a CRT (Cathode Ray Tube) display, and an organic EL display.
  • the polarizing plate which has the polyester resin film of this invention with high retardation is applied to a liquid crystal display element, the curvature of a liquid crystal display element can be prevented.
  • the rainbow-like color spots are caused by the retardation of the polyester resin film having a high retardation and the emission spectrum of the backlight light source.
  • a fluorescent tube such as a cold cathode tube or a hot cathode tube is used as a backlight source of a liquid crystal display device.
  • the spectral distribution of a fluorescent lamp such as a cold cathode tube or a hot cathode tube shows an emission spectrum having a plurality of peaks, and these discontinuous emission spectra are combined to obtain a white light source.
  • the transmitted light intensity varies depending on the wavelength. For this reason, when the backlight light source has a discontinuous emission spectrum, only a specific wavelength is strongly transmitted, and a rainbow-like color spot is generated.
  • the image display device is a liquid crystal display device
  • a backlight light source and a liquid crystal cell disposed between two polarizing plates as constituent members.
  • the configuration of the backlight may be an edge light method using a light guide plate, a reflection plate, or the like, or a direct type, but in the present invention, white is used as the backlight light source of the liquid crystal display device. It is preferable to use a light emitting diode (white LED: Light Emitting Diode) from the viewpoint of improving rainbow unevenness.
  • the white LED is an element that emits white by combining a phosphor with a phosphor system, that is, a light emitting diode that emits blue light or ultraviolet light using a compound semiconductor.
  • the phosphor include yttrium / aluminum / garnet yellow phosphor and terbium / aluminum / garnet yellow phosphor.
  • white light-emitting diodes which are composed of light-emitting elements that combine blue light-emitting diodes using compound semiconductors with yttrium, aluminum, and garnet-based yellow phosphors, have a continuous and broad emission spectrum and are also efficient in light emission Since it is excellent, it is suitable as a backlight light source of the image display device of the present invention.
  • the continuous emission spectrum means that there is no wavelength at which the light intensity becomes zero at least in the visible light region.
  • the white LED with low power consumption can be widely used according to the present invention, an effect of energy saving can be achieved.
  • the mechanism by which the occurrence of rainbow-like color spots is suppressed by the above embodiment is described in International Publication No. WO2011 / 162198, and the contents of this publication are incorporated in the present invention.
  • the image display device preferably includes a light source unit having at least blue, green, and red emission peaks as a backlight light source, and a liquid crystal cell having polarizing plates on both sides.
  • the emission spectrum of the light source unit has at least blue, green and red emission peaks, the full width at half maximum of the green and red emission peaks is 20 nm or more, and at least one minimum value L1 is present between wavelengths 460 nm to 520 nm.
  • Having at least one maximum value L2 between wavelengths 520 nm and 560 nm, having at least one minimum value L3 between wavelengths 560 nm and 620 nm, and the values of L1 and L3 being less than 35% of L2 Preferably there is.
  • the full width at half maximum of the green and red emission peaks is preferably 20 nm or more and 60 nm or less.
  • the half width W of the smaller half width is 50 nm or less. It is preferable that it is 20 nm or more and 40 nm or less. It is preferable that the full width at half maximum is small because the color reproducibility of the liquid crystal display device can be improved. Moreover, it is preferable for the full width at half maximum to be 20 nm or more because rainbow unevenness can be prevented from occurring by using the first protective film having Re of 5000 nm or more.
  • the values of L1 and L3 are more preferably less than 20% of L2, and most preferably less than 10%.
  • the light source unit may include a blue light emitting diode, a green light emitting diode, and a red light emitting diode, but from the viewpoint of cost reduction, the blue light emitting diode or the ultraviolet light emitting diode and the blue light emitting diode or the ultraviolet light emitting diode are used. It is preferable to have at least a phosphor capable of emitting light when excited by light.
  • a blue light emitting diode When using a blue light emitting diode, it is preferable to have a phosphor that emits green light and a phosphor that emits red light.
  • a phosphor that emits blue light When an ultraviolet light emitting diode is used, a phosphor that emits blue light, It is preferable to have a phosphor that emits green light and a phosphor that emits red light.
  • the phosphor may be enclosed in a blue light emitting diode or an ultraviolet light emitting diode, but in order to prevent deterioration of the phosphor due to heat, the phosphor is enclosed in a glass tube and the blue light emitting diode or ultraviolet light is emitted.
  • the light emitting diode is disposed so as to emit light, or a film containing a phosphor is disposed inside the light source unit.
  • the phosphor preferably includes quantum dots, at least one of which is a nanometer-sized semiconductor particle.
  • the quantum dot phosphor is preferable because it can reduce the full width at half maximum of the emission peak and can improve the color reproducibility of the liquid crystal display device.
  • a light source including quantum dots has high luminous efficiency, heat generation from the backlight unit can be suppressed as compared with a backlight unit using a white LED or a cold cathode fluorescent lamp (CCFL). Therefore, after the liquid crystal display device is stored in a high-temperature and high-humidity environment, an increase in temperature when it is turned on can be suppressed, and warpage of the liquid crystal cell and display unevenness can be further reduced.
  • CCFL cold cathode fluorescent lamp
  • the emission spectrum of the light source unit can be measured using a spectroradiometer “SR-3” manufactured by Topcon Technohouse Co., Ltd.
  • CCFL general cold cathode fluorescent lamp
  • Blue, green, and red have sharp emission peaks, so blue, green, and red light emission are separated, and the color reproducibility of liquid crystal display devices using CCFLs is generally higher than that of liquid crystal displays using white LEDs. Also excellent.
  • the full width at half maximum of the green and red light emission peaks is as small as about 2 nm or less, when a film having high Re is used as the first protective film, rainbow unevenness is visually recognized.
  • a white LED is usually manufactured by enclosing an organic phosphor that emits yellow or green and red light inside a blue light emitting diode.
  • the full width at half maximum of the green and red emission peaks is 20 nm or more. Therefore, in general, in a liquid crystal display device using a white LED, when a film having a high Re is used as the first protective film, rainbow unevenness occurs. It is suppressed.
  • a light source using a quantum dot phosphor generally has a full width at half maximum of green and red emission peaks of 20 nm or more, has at least one minimum value L1 between wavelengths of 460 nm and 520 nm, and has a wavelength of 520 nm to Since it has at least one maximum value L2 between 560 nm, at least one minimum value L3 between wavelengths 560 nm to 620 nm, and the values of L1 and L3 are less than 35% of L2, It can be suitably used as a light source unit.
  • the arrangement of the polarizing plate of the present invention is not particularly limited.
  • the polarizing plate of the present invention is preferably used as a polarizing plate for the viewing side in a liquid crystal display device.
  • the arrangement of the polyester resin film of the present invention having a high retardation in the in-plane direction is not particularly limited, but is arranged on the incident light side (light source side), the polarizing plate, the liquid crystal cell, and the outgoing light side (viewing side).
  • the polarizer protective film on the incident light side of the polarizing plate arranged on the incident light side, or the polarized light on the outgoing light side of the polarizing plate arranged on the outgoing light side is preferably the polyester resin film of the present invention having high in-plane retardation.
  • a particularly preferred embodiment is an embodiment in which the polarizer protective film on the exit light side of the polarizing plate disposed on the exit light side is the polyester resin film of the present invention having a high retardation in the in-plane direction.
  • the polyester resin film having a high retardation in the in-plane direction When a polyester resin film having a high retardation in the in-plane direction is disposed at a position other than the above, the polarization characteristics of the liquid crystal cell may be changed. Since the polyester resin film of the present invention having high retardation in the in-plane direction is preferably used in a place where polarization characteristics are not required, it is preferably used as a protective film for a polarizing plate at such a specific position. .
  • the liquid crystal cell of the liquid crystal display device preferably has a liquid crystal layer and two glass substrates provided on both sides of the liquid crystal layer.
  • the thickness of the glass substrate is preferably 0.5 mm or less, more preferably 0.4 mm or less, and particularly preferably 0.3 mm or less.
  • the liquid crystal cell of the liquid crystal display device is preferably in the IPS mode, VA mode, or FFS (Fringe Field Switching) mode.
  • the reaction product was transferred to a second esterification reaction vessel, and reacted with stirring at a temperature in the reaction vessel of 250 ° C. and an average residence time of 1.2 hours.
  • an ethylene glycol solution of magnesium acetate and an ethylene glycol solution of trimethyl phosphate are continuously supplied so that the added amount of Mg and the added amount of P are 65 ppm and 35 ppm in terms of element, respectively. did.
  • reaction tank temperature was 276 ° C.
  • reaction tank pressure was 5 torr (6.67 ⁇ 10 ⁇ 4 MPa)
  • residence time was about 1.2 hours.
  • the reaction (polycondensation) was performed under the conditions.
  • the reaction product (polyethylene terephthalate (PET)) was obtained by reaction (polycondensation) under the following conditions.
  • polyester pellets cross section: major axis: about 4 mm, minor axis: about 2 mm, length: about 3 mm).
  • the raw material polyester 1 (PET1) was dried to a moisture content of 20 ppm or less and then charged into the hopper 1 of a single-screw kneading extruder 1 having a diameter of 50 mm.
  • the raw material polyester 1 was melted at 300 ° C. and extruded from a die through a gear pump and a filter (pore diameter: 20 ⁇ m) under the following extrusion conditions.
  • the molten resin was extruded from the die under the conditions that the pressure fluctuation was 1% and the temperature distribution of the molten resin was 2%.
  • the back pressure was increased by 1% with respect to the average pressure in the barrel of the extruder, and the piping temperature of the extruder was heated at a temperature 2% higher than the average temperature in the barrel of the extruder.
  • the molten resin extruded from the die was extruded onto a cooling cast drum set at a temperature of 25 ° C., and was brought into close contact with the cooling cast drum using an electrostatic application method. It peeled using the peeling roll arrange
  • the refractive index of the unstretched polyester resin film was measured by the following method. Using two polarizing plates, the orientation axis direction of the unstretched polyester resin film was determined, and a 4 cm ⁇ 2 cm rectangle was cut out so that the orientation axis directions were orthogonal to each other, and used as a measurement sample.
  • the biaxial refractive index (nx, ny) orthogonal to each other and the refractive index (nz) in the thickness direction were determined by an Abbe refractometer (NAGO-4T, measurement wavelength 589 nm, manufactured by Atago Co., Ltd.).
  • the crystallinity of the unstretched polyester resin film was measured by the following method.
  • the crystallinity can be calculated from the density of the film. That is, the density X (g / cm 3) of the film, density 1.335 g / cm 3 in crystallinity 0%, using density 1.501g / cm 3 at 100% crystalline crystal from the following formula
  • the preheating temperature was 90 ° C., and the mixture was heated to a temperature at which stretching was possible.
  • the preheated unstretched polyester resin film 1 was stretched in the width direction using a tenter under the following conditions.
  • the film surface temperature was measured with a radiation thermometer (manufactured by Hayashi Denko, model number: RT61-2, used at an emissivity of 0.95).
  • the stretched polyester resin film was cooled in an intermediate cooling section so that cool air from the up and down direction was applied to the film from the blowing nozzle to the film, and the minimum film surface temperature TMC of the polyester resin film was 85 ° C.
  • the film surface temperature of the film in the intermediate cooling part was measured with a radiation thermometer (manufactured by Hayashi Denko, model number: RT61-2, used at an emissivity of 0.95).
  • the 10-point film surface temperature was measured uniformly in the MD direction in the intermediate cooling section, and the minimum temperature was defined as the minimum film surface temperature TMC.
  • Heat fixing part Next, hot fixing treatment was performed while hot air from the up and down direction was applied to the film from the hot air blowing nozzle to the film and the film surface temperature of the polyester resin film was controlled within the following range. ⁇ Condition> ⁇ Maximum film surface temperature (heat setting temperature): 170 °C Heat setting time: 15 seconds The heat setting temperature here is the DSC pre-peak temperature [° C.].
  • Heat relaxation part The heat-fixed polyester resin film was subjected to hot air from above and below the film through a hot air blowing nozzle and heated to the following temperature to relax the film.
  • -Thermal relaxation temperature Maximum film surface temperature of the heat fixing part -10 ° C (in the case of Example 1, 160 ° C)
  • TD direction film width direction
  • MD direction film flow direction
  • the polyester resin film after heat relaxation was cooled at a cooling temperature at which the film surface temperature of the film was 40 ° C. Also in the other Examples and Comparative Examples, the cooling temperature was set to the same value as the film film surface temperature when the clip opened the film. The film surface temperature was measured with a radiation thermometer (manufactured by Hayashi Denko, model number: RT61-2, used at an emissivity of 0.95).
  • both ends of the polyester resin film were trimmed by 20 cm.
  • the film width after trimming was 2.1 m.
  • a film having a length of 10,000 m was wound up in a roll form with a tension of 18 kg / m.
  • the polyester resin film of Example 1 having a thickness of 35 ⁇ m wound in a roll form was produced.
  • Example 1 [Examples 2 to 14, 16 and Comparative Examples 1 to 4, 6 to 9]
  • Example 1 As described in the following table, the longitudinal draw ratio, the transverse draw ratio, the film surface temperature at the start of the transverse draw, the film surface temperature at the end of the transverse draw, the minimum film surface temperature of the intermediate cooling section, and heat setting A polyester resin film was produced in the same manner as in Example 1 except that the maximum film surface temperature, the longitudinal relaxation rate, the lateral relaxation rate, and the film width were changed.
  • Example 15 Comparative Example 5
  • Example 1 a polyester resin film was produced in the same manner as in Example 1 except that the cooling in the intermediate cooling part was not performed.
  • the biaxial refractive index (nx, ny) orthogonal to each other and the refractive index (nz) in the thickness direction were determined by an Abbe refractometer (NAGO-4T, measurement wavelength 589 nm, manufactured by Atago Co., Ltd.). From the values, the values of nx-ny and (nx + ny) / 2-nz were calculated and listed in the table below.
  • n ⁇ is a film having a film width of 2 m and a film length of 0.5 m for each 100 mm of the film 1 m 2 of each Example and Comparative Example.
  • a piece of film was cut out.
  • size of the film piece it cut out to the same size as the method described by the above-mentioned refractive index measurement (Abbe refractometer).
  • the refractive index is measured by the same method as the above-described refractive index measurement, the nx ⁇ ny value is derived, and the difference between the maximum value and the minimum value of the nx ⁇ ny values of all the film pieces.
  • n ⁇ is a film having a film width of 2 m and a film length of 0.5 m for each 100 mm of the film 1 m 2 of each Example and Comparative Example.
  • the thickness of the obtained polyester resin film of each Example and Comparative Example was obtained as follows.
  • 50 points were sampled at equal intervals over 0.5 m in the longitudinally stretched direction (longitudinal direction), Furthermore, after sampling 50 points at equal intervals (50 equal parts in the width direction) over the entire width of the film in the film width direction (direction perpendicular to the longitudinal direction), the thicknesses of these 100 points were measured. The average thickness of these 100 points was determined and used as the thickness of the polyester resin film. The results are shown in the table below.
  • the above polarizer is sandwiched between the polyester film of each example and comparative example and the saponified cellulose acylate, and an aqueous PVA solution (fully saponified PVA5) is placed between the polarizer / polyester and between the cellulose acylate / polarizer. % Aqueous solution) was applied, these were pressure-bonded with a nip roll and bonded together, and then dried at 70 ° C. for 10 minutes to obtain a polarizing plate. The obtained polarizing plate was made into the polarizing plate of each Example and a comparative example.
  • the obtained two pairs of polarizing plates have the polyester film outside with respect to the liquid crystal cell, the absorption axis of the polarizer is orthogonally arranged, and a continuous light source (white LED) or a discontinuous light source (cold cathode tube) as a backlight. It was incorporated in a liquid crystal display device, and the light transmittance was adjusted to 50%.
  • the obtained liquid crystal display device was used as the image display device of each example and comparative example.
  • the polyester resin films of Examples manufactured so as to fall within the range of the above formulas (6) to (11) satisfy all the above formulas (1) to (4) and are viewed from the front. It can be seen that the rainbow unevenness and the rainbow unevenness when viewed from an oblique direction are simultaneously improved.
  • the polyester resin film of Comparative Example 1 or 2 manufactured without satisfying the formula (1 ′) does not satisfy the formula (1), the rainbow unevenness when viewed from the front, and when viewed from the oblique direction. Rainbow unevenness has not been improved at the same time.
  • the polyester resin films of Comparative Examples 3 to 9 produced without satisfying at least one of the above formulas (6) to (11) do not satisfy at least one of the formulas (2) to (4). The rainbow unevenness when viewed from the front and the rainbow unevenness when viewed from the diagonal are not simultaneously improved.
  • the polyester resin film of the comparative example 7 did not satisfy

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Polarising Elements (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Liquid Crystal (AREA)
  • Surface Treatment Of Optical Elements (AREA)

Abstract

La présente invention concerne un film de résine polyester satisfaisant aux formules (1) à (4), qui est capable d'améliorer une irrégularité iridescente lorsqu'il est observé depuis une direction oblique simultanément; un procédé de production d'un film de résine polyester; une plaque polarisante; un dispositif d'affichage d'image; un film de revêtement dur; un film de détection pour panneaux tactiles; un film de prévention de diffusion de verre; et un panneau tactile. 15 μm ≤ Th ≤ 60 μm formule (1) 0 < nx - ny ≤ 0,020 formule (2) 0,120 ≤ (nx + ny)/2 - nz < 0,160 formule (3) 0 < n∆ ≤ 0,014 formule (4)
PCT/JP2015/058674 2014-03-26 2015-03-23 Film de résine polyester, procédé de production de film de résine polyester, plaque polarisante, dispositif d'affichage d'image, film de revêtement dur, film de détection pour panneaux tactiles, film de prévention de diffusion de verre et panneau tactile WO2015146883A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201580015388.5A CN106104332B (zh) 2014-03-26 2015-03-23 聚酯树脂薄膜、聚酯树脂薄膜的制造方法、偏振片、图像显示装置、硬涂膜、触摸面板用传感器薄膜、玻璃飞散防止膜及触摸面板

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-064162 2014-03-26
JP2014064162A JP6297379B2 (ja) 2014-03-26 2014-03-26 ポリエステル樹脂フィルム、ポリエステル樹脂フィルムの製造方法、偏光板、画像表示装置、ハードコートフィルム、タッチパネル用センサーフィルム、ガラス飛散防止フィルム、およびタッチパネル

Publications (1)

Publication Number Publication Date
WO2015146883A1 true WO2015146883A1 (fr) 2015-10-01

Family

ID=54195397

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/058674 WO2015146883A1 (fr) 2014-03-26 2015-03-23 Film de résine polyester, procédé de production de film de résine polyester, plaque polarisante, dispositif d'affichage d'image, film de revêtement dur, film de détection pour panneaux tactiles, film de prévention de diffusion de verre et panneau tactile

Country Status (3)

Country Link
JP (1) JP6297379B2 (fr)
CN (1) CN106104332B (fr)
WO (1) WO2015146883A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109196392A (zh) * 2016-05-31 2019-01-11 Skc株式会社 偏振器保护膜、包括该保护膜的偏振片和显示装置

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6852264B2 (ja) * 2016-02-15 2021-03-31 東洋紡株式会社 光学フィルム検査用二軸延伸ポリエチレンテレフタレートフィルム
JP7120225B2 (ja) * 2017-05-31 2022-08-17 日本ゼオン株式会社 タッチセンサ基材及びその製造方法、タッチセンサ部材及びその製造方法、並びに、表示装置
KR101952364B1 (ko) * 2017-10-27 2019-02-26 에스케이씨 주식회사 편광판용 보호 필름 및 이를 포함하는 액정표시장치
KR20210125514A (ko) 2019-02-08 2021-10-18 도요보 가부시키가이샤 폴리에스테르 필름과 그 용도
EP3923263A4 (fr) 2019-02-08 2022-11-09 Toyobo Co., Ltd. Écran pliable et équipement terminal portable
KR20220016133A (ko) 2019-05-28 2022-02-08 도요보 가부시키가이샤 폴리에스테르 필름과 그 용도
KR20220016131A (ko) 2019-05-28 2022-02-08 도요보 가부시키가이샤 적층 필름과 그 용도
JP7480581B2 (ja) 2019-05-28 2024-05-10 東洋紡株式会社 ポリエステルフィルムとその用途
KR102415828B1 (ko) * 2019-09-30 2022-06-30 코오롱인더스트리 주식회사 폴리에스테르 다층 필름 및 그 제조방법
CN113752600B (zh) * 2021-08-23 2023-10-13 四川东方绝缘材料股份有限公司 一种偏光片离型膜基膜的生产线及其制备方法

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5757630A (en) * 1980-09-25 1982-04-06 Teijin Ltd Manufacture of biaxially drawn polyester film
JPS6270046A (ja) * 1985-09-24 1987-03-31 ダイアホイルヘキスト株式会社 透明性に優れた複合化二軸延伸ポリエステルフイルム
JPH04117427A (ja) * 1990-09-06 1992-04-17 Teijin Ltd 金属貼合せ成形加工用ポリエステルフイルム
JPH08169084A (ja) * 1994-12-16 1996-07-02 Toray Ind Inc 金属／フイルム積層体の製造方法
JPH09150492A (ja) * 1995-09-28 1997-06-10 Toray Ind Inc 金属板ラミネート用積層フイルム
JP2005023107A (ja) * 2003-06-30 2005-01-27 Toray Ind Inc 二軸配向ポリエステルフィルム
JP2007279469A (ja) * 2006-04-10 2007-10-25 Konica Minolta Opto Inc 偏光板及び液晶表示装置
JP2010107892A (ja) * 2008-10-31 2010-05-13 Nitto Denko Corp 液晶表示装置
JP2010177656A (ja) * 2009-02-02 2010-08-12 Samsung Electronics Co Ltd 発光ダイオードユニット及びこれを含む表示装置
JP2011099089A (ja) * 2009-10-09 2011-05-19 Toyobo Co Ltd 二軸配向ポリエチレンテレフタレートフィルム
JP2011112928A (ja) * 2009-11-27 2011-06-09 Nitto Denko Corp 画像表示装置
JP2011168652A (ja) * 2010-02-16 2011-09-01 Lintec Corp 飛散防止用粘着シート、飛散防止ガラスパネル、および携帯情報端末機器
JP2012188631A (ja) * 2011-03-14 2012-10-04 Fujifilm Corp ポリエステルフィルム、及びその製造方法、太陽電池用バックシート、並びに、太陽電池モジュール
JP2012220879A (ja) * 2011-04-13 2012-11-12 Toyobo Co Ltd 偏光子保護用二軸配向ポリエチレンテレフタレートフィルム
JP2013047317A (ja) * 2011-02-15 2013-03-07 Fujifilm Corp ２軸延伸ポリエステルフィルム及びその製造方法、太陽電池用バックシート、並びに太陽電池モジュール
WO2013100041A1 (fr) * 2011-12-28 2013-07-04 東洋紡株式会社 Dispositif d'affichage à cristaux liquides, polariseur et film de protection d'élément polarisant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW226977B (fr) * 1990-09-06 1994-07-21 Teijin Ltd

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5757630A (en) * 1980-09-25 1982-04-06 Teijin Ltd Manufacture of biaxially drawn polyester film
JPS6270046A (ja) * 1985-09-24 1987-03-31 ダイアホイルヘキスト株式会社 透明性に優れた複合化二軸延伸ポリエステルフイルム
JPH04117427A (ja) * 1990-09-06 1992-04-17 Teijin Ltd 金属貼合せ成形加工用ポリエステルフイルム
JPH08169084A (ja) * 1994-12-16 1996-07-02 Toray Ind Inc 金属／フイルム積層体の製造方法
JPH09150492A (ja) * 1995-09-28 1997-06-10 Toray Ind Inc 金属板ラミネート用積層フイルム
JP2005023107A (ja) * 2003-06-30 2005-01-27 Toray Ind Inc 二軸配向ポリエステルフィルム
JP2007279469A (ja) * 2006-04-10 2007-10-25 Konica Minolta Opto Inc 偏光板及び液晶表示装置
JP2010107892A (ja) * 2008-10-31 2010-05-13 Nitto Denko Corp 液晶表示装置
JP2010177656A (ja) * 2009-02-02 2010-08-12 Samsung Electronics Co Ltd 発光ダイオードユニット及びこれを含む表示装置
JP2011099089A (ja) * 2009-10-09 2011-05-19 Toyobo Co Ltd 二軸配向ポリエチレンテレフタレートフィルム
JP2011112928A (ja) * 2009-11-27 2011-06-09 Nitto Denko Corp 画像表示装置
JP2011168652A (ja) * 2010-02-16 2011-09-01 Lintec Corp 飛散防止用粘着シート、飛散防止ガラスパネル、および携帯情報端末機器
JP2013047317A (ja) * 2011-02-15 2013-03-07 Fujifilm Corp ２軸延伸ポリエステルフィルム及びその製造方法、太陽電池用バックシート、並びに太陽電池モジュール
JP2012188631A (ja) * 2011-03-14 2012-10-04 Fujifilm Corp ポリエステルフィルム、及びその製造方法、太陽電池用バックシート、並びに、太陽電池モジュール
JP2012220879A (ja) * 2011-04-13 2012-11-12 Toyobo Co Ltd 偏光子保護用二軸配向ポリエチレンテレフタレートフィルム
WO2013100041A1 (fr) * 2011-12-28 2013-07-04 東洋紡株式会社 Dispositif d'affichage à cristaux liquides, polariseur et film de protection d'élément polarisant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109196392A (zh) * 2016-05-31 2019-01-11 Skc株式会社 偏振器保护膜、包括该保护膜的偏振片和显示装置
US11008430B2 (en) * 2016-05-31 2021-05-18 Skc Co., Ltd. Polarizer protection film, polarizing plate comprising same, and display provided with same

Also Published As

Publication number Publication date
CN106104332A (zh) 2016-11-09
JP2015184664A (ja) 2015-10-22
CN106104332B (zh) 2018-12-04
JP6297379B2 (ja) 2018-03-20

Similar Documents

Publication Publication Date Title
JP6297379B2 (ja) ポリエステル樹脂フィルム、ポリエステル樹脂フィルムの製造方法、偏光板、画像表示装置、ハードコートフィルム、タッチパネル用センサーフィルム、ガラス飛散防止フィルム、およびタッチパネル
JP6314228B2 (ja) 一軸配向ポリエステルフィルム、ハードコートフィルム、タッチパネル用センサーフィルム、飛散防止フィルム、反射防止フィルム、タッチパネルおよび一軸配向ポリエステルフィルムの製造方法
WO2015182494A1 (fr) Film polyester, son procédé de production, plaque de polarisation, dispositif d&#39;affichage d&#39;image, film de revêtement dur, et panneau tactile
JP4918944B2 (ja) 二軸配向ポリエチレンテレフタレートフィルムを用いた偏光板
WO2015141533A1 (fr) Film polarisant réfléchissant pour polariseur d&#39;affichage à cristaux liquides, polariseur d&#39;affichage à cristaux liquides le comprenant, élément optique d&#39;affichage à cristaux liquides, et dispositif d&#39;affichage à cristaux liquides
JP5614506B2 (ja) 液晶表示装置、偏光板および偏光子保護フィルム
JP2012220879A (ja) 偏光子保護用二軸配向ポリエチレンテレフタレートフィルム
KR20160002902A (ko) 폴리에스터 필름, 편광판 및 화상 표시 장치
JP6264408B2 (ja) 偏光板
TWI816867B (zh) 附相位差層之偏光板及使用了該附相位差層之偏光板的影像顯示裝置
JP2018185535A (ja) 液晶表示装置、偏光板及び偏光子保護フィルム
JP5991416B2 (ja) 偏光板
JP6127011B2 (ja) ポリエステルフィルム、ポリエステルフィルムの製造方法、偏光板、画像表示装置、ハードコートフィルムおよびタッチパネル
WO2015046122A1 (fr) Film de polyester, procédé de production de film de polyester, plaque polarisante, et dispositif d&#39;affichage d&#39;image
TWI816868B (zh) 帶相位差層的偏光板及使用了該帶相位差層的偏光板的影像顯示裝置
JP6171021B2 (ja) ポリエステルフィルムおよびポリエステルフィルムの製造方法、偏光板ならびに画像表示装置
JP6199399B2 (ja) ポリエステルフィルムおよびポリエステルフィルムの製造方法、偏光板ならびに画像表示装置
JP2023001907A (ja) フィルム
JP6645005B2 (ja) 偏光子保護フィルム、偏光板、それを用いた液晶表示装置
JP2018055108A (ja) 液晶ディスプレイ用偏光子保護フィルム、偏光板及び液晶ディスプレイ
TWI827659B (zh) 帶相位差層的偏光板及使用了該帶相位差層的偏光板的影像顯示裝置
TW202348697A (zh) 偏光膜之製造方法
TW202401115A (zh) 偏光膜之製造方法
JP2016099553A (ja) 液晶表示装置及び偏光板

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15768971

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15768971

Country of ref document: EP

Kind code of ref document: A1